Fix all Warnings (#781)

* Warnings ### What's done: Fixed all warnings Added flags in pom and gradle file
saveourtool · Apr 30, 2021 · 4c81b3f · 4c81b3f · 0pdd · Apr 30, 2021
1 parent 4c82083
commit 4c81b3f
Show file tree

Hide file tree

Showing 48 changed files with 122 additions and 139 deletions.
diff --git a/...t-common/src/main/kotlin/org/cqfn/diktat/common/config/reader/JsonResourceConfigReader.kt b/...t-common/src/main/kotlin/org/cqfn/diktat/common/config/reader/JsonResourceConfigReader.kt
@@ -57,6 +57,9 @@ abstract class JsonResourceConfigReader<T> {
     protected abstract fun parseResource(fileStream: BufferedReader): T
 
     companion object {
+        /**
+         * A [Logger] that can be used
+         */
         val log: Logger = LoggerFactory.getLogger(JsonResourceConfigReader::class.java)
     }
 }
diff --git a/diktat-common/src/main/kotlin/org/cqfn/diktat/common/config/rules/RulesConfigReader.kt b/diktat-common/src/main/kotlin/org/cqfn/diktat/common/config/rules/RulesConfigReader.kt
@@ -19,6 +19,9 @@ import java.util.concurrent.atomic.AtomicInteger
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.decodeFromString
 
+/**
+ * Name of common configuration
+ */
 const val DIKTAT_COMMON = "DIKTAT_COMMON"
 
 /**
@@ -49,7 +52,6 @@ data class RulesConfig(
  * @property config a map of strings with configuration options for a particular rule
  */
 open class RuleConfiguration(protected val config: Map<String, String>)
-object EmptyConfiguration : RuleConfiguration(emptyMap())
 
 /**
  * class returns the list of configurations that we have read from a yml: diktat-analysis.yml
@@ -87,6 +89,9 @@ open class RulesConfigReader(override val classLoader: ClassLoader) : JsonResour
     }
 
     companion object {
+        /**
+         * A [Logger] that can be used
+         */
         val log: Logger = LoggerFactory.getLogger(RulesConfigReader::class.java)
     }
 }

diff --git a/diktat-gradle-plugin/build.gradle.kts b/diktat-gradle-plugin/build.gradle.kts
@@ -3,7 +3,7 @@ import org.gradle.nativeplatform.platform.internal.DefaultNativePlatform.getCurr
 
 plugins {
     `java-gradle-plugin`
-    kotlin("jvm") version "1.4.32"
+    kotlin("jvm") version "1.3.72"
     jacoco
     id("pl.droidsonroids.jacoco.testkit") version "1.0.7"
     id("org.gradle.test-retry") version "1.2.1"
@@ -26,10 +26,13 @@ val jacocoVersion = project.properties.getOrDefault("jacocoVersion", "0.8.6") as
 dependencies {
     implementation(kotlin("gradle-plugin-api"))
 
-    implementation("com.pinterest.ktlint:ktlint-core:$ktlintVersion") {
-        exclude("com.pinterest.ktlint", "ktlint-ruleset-standard")
+    implementation("org.cqfn.diktat:diktat-rules:$diktatVersion") {
+        exclude("org.jetbrains.kotlin", "kotlin-compiler-embeddable")
+        exclude("org.jetbrains.kotlin", "kotlin-stdlib-jdk8")
+        exclude("org.jetbrains.kotlin", "kotlin-stdlib-jdk7")
+        exclude("org.jetbrains.kotlin", "kotlin-stdlib")
+        exclude("org.jetbrains.kotlin", "kotlin-stdlib-common")
     }
-    implementation("org.cqfn.diktat:diktat-rules:$diktatVersion")
 
     testImplementation("org.junit.jupiter:junit-jupiter-api:$junitVersion")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:$junitVersion")
@@ -62,7 +65,8 @@ tasks.withType<KotlinCompile> {
         apiVersion = "1.3"
         jvmTarget = "1.8"
         useIR = true
-    }
+        allWarningsAsErrors = true
+        }
 
     dependsOn.add(generateVersionsFile)
 }

diff --git a/diktat-gradle-plugin/src/main/kotlin/org/cqfn/diktat/plugin/gradle/DiktatGradlePlugin.kt b/diktat-gradle-plugin/src/main/kotlin/org/cqfn/diktat/plugin/gradle/DiktatGradlePlugin.kt
@@ -44,9 +44,24 @@ class DiktatGradlePlugin : Plugin<Project> {
     }
 
     companion object {
+        /**
+         * Task to check diKTat
+         */
         const val DIKTAT_CHECK_TASK = "diktatCheck"
+
+        /**
+         * DiKTat configuration
+         */
         const val DIKTAT_CONFIGURATION = "diktat"
+
+        /**
+         * DiKTat extension
+         */
         const val DIKTAT_EXTENSION = "diktat"
+
+        /**
+         * Task to run diKTat with fix
+         */
         const val DIKTAT_FIX_TASK = "diktatFix"
     }
 }
diff --git a/diktat-gradle-plugin/src/main/kotlin/org/cqfn/diktat/plugin/gradle/DiktatJavaExecTaskBase.kt b/diktat-gradle-plugin/src/main/kotlin/org/cqfn/diktat/plugin/gradle/DiktatJavaExecTaskBase.kt
@@ -93,6 +93,9 @@ open class DiktatJavaExecTaskBase @Inject constructor(
         project.logger.debug("Setting JavaExec args to $args")
     }
 
+    /**
+     * Function to execute diKTat
+     */
     @TaskAction
     override fun exec() {
         if (shouldRun) {

diff --git a/diktat-rules/pom.xml b/diktat-rules/pom.xml
@@ -119,6 +119,11 @@
                         </configuration>
                     </execution>
                 </executions>
+                <configuration>
+                    <args>
+                        <arg>-Xinline-classes</arg>
+                    </args>
+                </configuration>
             </plugin>
 
             <plugin>

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/constants/Warnings.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/constants/Warnings.kt
@@ -28,7 +28,7 @@ typealias ListOfPairs = MutableList<Pair<ASTNode, String>>
     "WRONG_NEWLINES"
 )
 enum class Warnings(
-    val canBeAutoCorrected: Boolean,
+    private val canBeAutoCorrected: Boolean,
     val ruleId: String,
     private val warn: String) : Rule {
     // ======== dummy test warning ======

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/dummy/DummyWarning.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/dummy/DummyWarning.kt
@@ -17,6 +17,7 @@ class DummyWarning(configRules: List<RulesConfig>) : DiktatRule(
         Warnings.FILE_NAME_MATCH_CLASS
     )
 ) {
+    @Suppress("UNUSED")
     private lateinit var filePath: String
 
     @Suppress("EmptyFunctionBlock")

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/generation/Generation.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/generation/Generation.kt
@@ -64,8 +64,8 @@ private fun validateYear() {
     val files = File("diktat-rules/src/test/resources/test/paragraph2/header")
     files
         .listFiles()
-        .filterNot { it.name.contains("CopyrightDifferentYearTest.kt") }
-        .forEach { file ->
+        ?.filterNot { it.name.contains("CopyrightDifferentYearTest.kt") }
+        ?.forEach { file ->
             val tempFile = createTempFile().toFile()
             tempFile.printWriter().use { writer ->
                 file.forEachLine { line ->

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/DiktatRule.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/DiktatRule.kt
@@ -21,7 +21,7 @@ private typealias DiktatConfigRule = org.cqfn.diktat.common.config.rules.Rule
 @Suppress("TooGenericExceptionCaught")
 abstract class DiktatRule(id: String,
                           val configRules: List<RulesConfig>,
-                          val inspections: List<DiktatConfigRule>) : Rule(id) {
+                          private val inspections: List<DiktatConfigRule>) : Rule(id) {
     /**
      * Default value is false
      */

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter1/IdentifierNaming.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter1/IdentifierNaming.kt
@@ -50,7 +50,6 @@ import com.pinterest.ktlint.core.ast.ElementType.DESTRUCTURING_DECLARATION
 import com.pinterest.ktlint.core.ast.ElementType.DESTRUCTURING_DECLARATION_ENTRY
 import com.pinterest.ktlint.core.ast.ElementType.FILE
 import com.pinterest.ktlint.core.ast.ElementType.FUNCTION_TYPE
-import com.pinterest.ktlint.core.ast.ElementType.PROPERTY
 import com.pinterest.ktlint.core.ast.ElementType.REFERENCE_EXPRESSION
 import com.pinterest.ktlint.core.ast.ElementType.TYPE_PARAMETER
 import com.pinterest.ktlint.core.ast.ElementType.TYPE_REFERENCE
@@ -163,7 +162,7 @@ class IdentifierNaming(configRules: List<RulesConfig>) : DiktatRule(
         var namesOfVariables = extractVariableIdentifiers(node)
         // Only local private properties will be autofix in order not to break code if there are usages in other files.
         // Destructuring declarations are only allowed for local variables/values, so we don't need to calculate `isFix` for every node in `namesOfVariables`
-        val isFix = isFixMode && if (node.elementType == PROPERTY) (node.psi as KtProperty).run { isLocal || isPrivate() } else true
+        val isFix = isFixMode && if (node.elementType == ElementType.PROPERTY) (node.psi as KtProperty).run { isLocal || isPrivate() } else true
         namesOfVariables
             .forEach { variableName ->
                 // variable should not contain only one letter in it's name. This is a bad example: b512

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/comments/CommentsRule.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/comments/CommentsRule.kt
@@ -145,7 +145,7 @@ class CommentsRule(configRules: List<RulesConfig>) : DiktatRule(
         private val importOrPackageRegex = """^(import|package)?\s+([a-zA-Z.])+;*$""".toRegex()
         private val functionRegex = """^(public|private|protected)*\s*(override|abstract|actual|expect)*\s?fun\s+\w+(\(.*\))?(\s*:\s*\w+)?\s*[{=]${'$'}""".toRegex()
         private val rightBraceRegex = """^\s*}$""".toRegex()
-        private val requirePartOfCode = """val |var |=|(\{((.|\n)*)\})""".toRegex()
+        private val requirePartOfCode = """val |var |=|(\{((.|\n)*)})""".toRegex()
         private val codeFileStartCases = listOf(classRegex, importOrPackageRegex, functionRegex, rightBraceRegex)
         private val eolCommentStart = """// \S""".toRegex()
     }

diff --git a/...t-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/kdoc/CommentsFormatting.kt b/...t-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/kdoc/CommentsFormatting.kt
@@ -56,8 +56,6 @@ class CommentsFormatting(configRules: List<RulesConfig>) : DiktatRule(
         IF_ELSE_COMMENTS, WRONG_NEWLINES_AROUND_KDOC)) {
     /**
      * @param node
-     * @param autoCorrect
-     * @param emit
      */
     override fun logic(node: ASTNode) {
         val configuration = CommentsFormattingConfiguration(

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/kdoc/KdocComments.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/kdoc/KdocComments.kt
@@ -51,8 +51,6 @@ class KdocComments(configRules: List<RulesConfig>) : DiktatRule(
         KDOC_NO_CONSTRUCTOR_PROPERTY_WITH_COMMENT, MISSING_KDOC_CLASS_ELEMENTS, MISSING_KDOC_TOP_LEVEL)) {
     /**
      * @param node
-     * @param autoCorrect
-     * @param emit
      */
     override fun logic(node: ASTNode) {
         val config = configRules.getCommonConfiguration()
@@ -76,13 +74,13 @@ class KdocComments(configRules: List<RulesConfig>) : DiktatRule(
             ?.findChildByType(KDOC) ?: return
         val propertiesInKdoc = kdocBeforeClass
             .kDocTags()
-            ?.filter { it.knownTag == KDocKnownTag.PROPERTY }
+            .filter { it.knownTag == KDocKnownTag.PROPERTY }
         val propertyNames = (node.psi as KtParameterList)
             .parameters
             .mapNotNull { it.nameIdentifier?.text }
         propertiesInKdoc
-            ?.filterNot { it.getSubjectName() == null || it.getSubjectName() in propertyNames }
-            ?.forEach { KDOC_EXTRA_PROPERTY.warn(configRules, emitWarn, isFixMode, it.text, it.node.startOffset, node) }
+            .filterNot { it.getSubjectName() == null || it.getSubjectName() in propertyNames }
+            .forEach { KDOC_EXTRA_PROPERTY.warn(configRules, emitWarn, isFixMode, it.text, it.node.startOffset, node) }
     }
 
     @Suppress("UnsafeCallOnNullableType", "ComplexMethod")
@@ -126,7 +124,7 @@ class KdocComments(configRules: List<RulesConfig>) : DiktatRule(
     private fun checkBasicKdocBeforeClass(node: ASTNode, kdocBeforeClass: ASTNode) {
         val propertyInClassKdoc = kdocBeforeClass
             .kDocTags()
-            ?.firstOrNull { it.knownTag == KDocKnownTag.PROPERTY && it.getSubjectName() == node.findChildByType(IDENTIFIER)!!.text }
+            .firstOrNull { it.knownTag == KDocKnownTag.PROPERTY && it.getSubjectName() == node.findChildByType(IDENTIFIER)!!.text }
         if (propertyInClassKdoc == null && node.getFirstChildWithType(MODIFIER_LIST).isAccessibleOutside()) {
             KDOC_NO_CONSTRUCTOR_PROPERTY.warnAndFix(configRules, emitWarn, isFixMode,
                 "add <${node.findChildByType(IDENTIFIER)!!.text}> to KDoc", node.startOffset, node) {
@@ -142,12 +140,12 @@ class KdocComments(configRules: List<RulesConfig>) : DiktatRule(
         prevComment: ASTNode) {
         val propertyInClassKdoc = kdocBeforeClass
             .kDocTags()
-            ?.firstOrNull { it.knownTag == KDocKnownTag.PROPERTY && it.getSubjectName() == node.findChildByType(IDENTIFIER)!!.text }
+            .firstOrNull { it.knownTag == KDocKnownTag.PROPERTY && it.getSubjectName() == node.findChildByType(IDENTIFIER)!!.text }
             ?.node
         val propertyInLocalKdoc = if (prevComment.elementType == KDOC) {
             prevComment
                 .kDocTags()
-                ?.firstOrNull { it.knownTag == KDocKnownTag.PROPERTY && it.getSubjectName() == node.findChildByType(IDENTIFIER)!!.text }
+                .firstOrNull { it.knownTag == KDocKnownTag.PROPERTY && it.getSubjectName() == node.findChildByType(IDENTIFIER)!!.text }
                 ?.node
         } else {
             null

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/kdoc/KdocFormatting.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/kdoc/KdocFormatting.kt
@@ -71,8 +71,6 @@ class KdocFormatting(configRules: List<RulesConfig>) : DiktatRule(
 
     /**
      * @param node
-     * @param autoCorrect
-     * @param emit
      */
     override fun logic(node: ASTNode) {
         versionRegex ?: run {
@@ -86,8 +84,8 @@ class KdocFormatting(configRules: List<RulesConfig>) : DiktatRule(
             checkNoDeprecatedTag(node)
             checkEmptyTags(node.kDocTags())
             checkSpaceAfterTag(node.kDocTags())
-            node.kDocBasicTags()?.let { checkEmptyLineBeforeBasicTags(it) }
-            node.kDocBasicTags()?.let { checkEmptyLinesBetweenBasicTags(it) }
+            checkEmptyLineBeforeBasicTags(node.kDocBasicTags())
+            checkEmptyLinesBetweenBasicTags(node.kDocBasicTags())
             checkBasicTagsOrder(node)
             checkNewLineAfterSpecialTags(node)
             checkAuthorAndDate(node)
@@ -111,7 +109,7 @@ class KdocFormatting(configRules: List<RulesConfig>) : DiktatRule(
     @Suppress("UnsafeCallOnNullableType")
     private fun checkNoDeprecatedTag(node: ASTNode) {
         val kdocTags = node.kDocTags()
-        kdocTags?.find { it.name == "deprecated" }
+        kdocTags.find { it.name == "deprecated" }
             ?.let { kdocTag ->
                 KDOC_NO_DEPRECATED_TAG.warnAndFix(configRules, emitWarn, isFixMode, kdocTag.text, kdocTag.node.startOffset, kdocTag.node) {
                     val kdocSection = kdocTag.node.treeParent
@@ -175,23 +173,22 @@ class KdocFormatting(configRules: List<RulesConfig>) : DiktatRule(
         val kdocTags = node.kDocTags()
         // distinct basic tags which are present in current KDoc, in proper order
         val basicTagsOrdered = basicTagsList.filter { basicTag ->
-            kdocTags?.find { it.knownTag == basicTag } != null
+            kdocTags.find { it.knownTag == basicTag } != null
         }
         // all basic tags from current KDoc
-        val basicTags = kdocTags?.filter { basicTagsOrdered.contains(it.knownTag) }
+        val basicTags = kdocTags.filter { basicTagsOrdered.contains(it.knownTag) }
         val isTagsInCorrectOrder = basicTags
-            ?.fold(mutableListOf<KDocTag>()) { acc, kdocTag ->
+            .fold(mutableListOf<KDocTag>()) { acc, kdocTag ->
                 if (acc.size > 0 && acc.last().knownTag != kdocTag.knownTag) {
                     acc.add(kdocTag)
                 } else if (acc.size == 0) {
                     acc.add(kdocTag)
                 }
                 acc
             }
-            ?.map { it.knownTag }
-            ?.equals(basicTagsOrdered)
+            .map { it.knownTag } == basicTagsOrdered
 
-        if (kdocTags != null && !isTagsInCorrectOrder!!) {
+        if (!isTagsInCorrectOrder) {
             KDOC_WRONG_TAGS_ORDER.warnAndFix(configRules, emitWarn, isFixMode,
                 basicTags.joinToString(", ") { "@${it.name}" }, basicTags
                     .first()
@@ -326,11 +323,11 @@ class KdocFormatting(configRules: List<RulesConfig>) : DiktatRule(
 
     private fun checkAuthorAndDate(node: ASTNode) {
         node.kDocTags()
-            ?.filter {
+            .filter {
                 it.knownTag == KDocKnownTag.AUTHOR ||
                         it.knownTag == KDocKnownTag.SINCE && it.hasInvalidVersion()
             }
-            ?.forEach {
+            .forEach {
                 KDOC_CONTAINS_DATE_OR_AUTHOR.warn(configRules, emitWarn, isFixMode, it.text.trim(), it.startOffset, it.node)
             }
     }
@@ -342,7 +339,7 @@ class KdocFormatting(configRules: List<RulesConfig>) : DiktatRule(
                 (treeNext == null || treeNext.elementType == WHITE_SPACE && treeNext.text.count { it == '\n' } == 1)
     }
 
-    private fun ASTNode.kDocBasicTags() = kDocTags()?.filter { basicTagsList.contains(it.knownTag) }
+    private fun ASTNode.kDocBasicTags() = kDocTags().filter { basicTagsList.contains(it.knownTag) }
 
     private fun ASTNode.previousAsterisk() = prevSibling { it.elementType == KDOC_LEADING_ASTERISK }
 

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/kdoc/KdocMethods.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter2/kdoc/KdocMethods.kt
@@ -72,8 +72,6 @@ class KdocMethods(configRules: List<RulesConfig>) : DiktatRule(
         KDOC_WITHOUT_THROWS_TAG, MISSING_KDOC_ON_FUNCTION)) {
     /**
      * @param node
-     * @param autoCorrect
-     * @param emit
      */
     override fun logic(node: ASTNode) {
         if (node.elementType == FUN && node.getFirstChildWithType(MODIFIER_LIST).isAccessibleOutside() && !node.isOverridden()) {

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/MagicNumberRule.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/MagicNumberRule.kt
@@ -8,7 +8,6 @@ import org.cqfn.diktat.ruleset.rules.DiktatRule
 import org.cqfn.diktat.ruleset.utils.*
 
 import com.pinterest.ktlint.core.ast.ElementType.BINARY_EXPRESSION
-import com.pinterest.ktlint.core.ast.ElementType.CONST_KEYWORD
 import com.pinterest.ktlint.core.ast.ElementType.ENUM_ENTRY
 import com.pinterest.ktlint.core.ast.ElementType.FLOAT_CONSTANT
 import com.pinterest.ktlint.core.ast.ElementType.FUN

diff --git a/...t-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/StringConcatenationRule.kt b/...t-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/StringConcatenationRule.kt
@@ -6,7 +6,6 @@ import org.cqfn.diktat.ruleset.rules.DiktatRule
 import org.cqfn.diktat.ruleset.utils.*
 
 import com.pinterest.ktlint.core.ast.ElementType.BINARY_EXPRESSION
-import com.pinterest.ktlint.core.ast.ElementType.CALL_EXPRESSION
 import com.pinterest.ktlint.core.ast.ElementType.DOT_QUALIFIED_EXPRESSION
 import com.pinterest.ktlint.core.ast.ElementType.OPERATION_REFERENCE
 import com.pinterest.ktlint.core.ast.ElementType.PLUS

diff --git a/...t-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/files/FileStructureRule.kt b/...t-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/files/FileStructureRule.kt
@@ -67,8 +67,7 @@ class FileStructureRule(configRules: List<RulesConfig>) : DiktatRule(
     }
     private val standardImportsAsName = StandardPlatforms
         .values()
-        .map { it to it.packages }
-        .toMap()
+        .associate { it to it.packages }
         .mapValues { (_, value) ->
             value.map { it.split(PACKAGE_SEPARATOR).map(Name::identifier) }
         }

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/files/NewlinesRule.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/files/NewlinesRule.kt
@@ -544,15 +544,15 @@ class NewlinesRule(configRules: List<RulesConfig>) : DiktatRule(
         }
         val callsByNewLine: ListOfList = mutableListOf()
         var callsInOneNewLine: MutableList<ASTNode> = mutableListOf()
-        this.forEach { node ->
-            if (node.treePrev.isFollowedByNewline() || node.treePrev.isWhiteSpaceWithNewline()) {
+        this.forEach { astNode ->
+            if (astNode.treePrev.isFollowedByNewline() || astNode.treePrev.isWhiteSpaceWithNewline()) {
                 callsByNewLine.add(callsInOneNewLine)
                 callsInOneNewLine = mutableListOf()
-                callsInOneNewLine.add(node)
+                callsInOneNewLine.add(astNode)
             } else {
-                callsInOneNewLine.add(node)
+                callsInOneNewLine.add(astNode)
             }
-            if (node.treePrev.elementType == POSTFIX_EXPRESSION && !node.treePrev.isFollowedByNewline() && configuration.maxCallsInOneLine == 1) {
+            if (astNode.treePrev.elementType == POSTFIX_EXPRESSION && !astNode.treePrev.isFollowedByNewline() && configuration.maxCallsInOneLine == 1) {
                 return true
             }
         }

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/files/WhiteSpaceRule.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter3/files/WhiteSpaceRule.kt
@@ -388,7 +388,8 @@ class WhiteSpaceRule(configRules: List<RulesConfig>) : DiktatRule(
         0
     } else {
         // this can happen, e.g. in lambdas after an arrow, where block can be not surrounded by braces
-        val isBlockStartingWithComment = treeNext.elementType == BLOCK && treeNext.firstChildNode.isPartOfComment()
+        // treeNext may not have children ( {_, _ -> })
+        val isBlockStartingWithComment = treeNext.elementType == BLOCK && treeNext.firstChildNode?.isPartOfComment() == true
         if (textContains('\n') || treeNext.isPartOfComment() || isBlockStartingWithComment) null else text.count { it == ' ' }
     }
 

diff --git a/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter4/ImmutableValNoVarRule.kt b/diktat-rules/src/main/kotlin/org/cqfn/diktat/ruleset/rules/chapter4/ImmutableValNoVarRule.kt
@@ -30,7 +30,7 @@ class ImmutableValNoVarRule(configRules: List<RulesConfig>) : DiktatRule(
                 .findAllVariablesWithAssignments { it.name != null && it.isVar }
                 .filter { it.value.isEmpty() }
 
-            varNoAssignments.forEach { (property, usages) ->
+            varNoAssignments.forEach { (_, _) ->
                 // FixMe: raise another warning and fix the code (change to val) for variables without assignment
             }